Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38221 Ecovyst Inc. Delaware 81-3406833 (State or other jurisdiction of incorporation or organization) 300 Lin ...

Ecovyst Inc. (NYSE:ECVT) Q4 2022 Earnings Conference Call February 28, 2023 11:00 AM ET Company Participants Gene Shiels - Director of Investor Relations Kurt Bitting - Chief Executive Officer and Director Mike Feehan - Chief Financial Officer Conference Call Participants John McNulty - BMO Aleksey Yefremov - KeyBanc Capital Markets Patrick Cunningham - Citi David Begleiter - Deutsche Bank Hamed Khorsand - BWS Daniel Rizzo - Jefferies David Silver - CLK Operator Good morning. My name is Shelby, and I will b ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38221 Ecovyst Inc. | Title of each class | Trading symbol | Name of each exchange on which registered | | --- | --- | --- | | Common stoc ...

Table of Contents Title of each class Trading symbol Name of each exchange on which registered Common stock, par value $0.01 per share ECVT New York Stock Exchange 1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition ...

Ecovyst Inc. (NYSE:ECVT) Q3 2022 Earnings Conference Call November 1, 2022 11:00 AM ET Company Participants Gene Shiels - Director of Investor Relations Kurt Bitting - Chief Executive Officer and Director Mike Feehan - Chief Financial Officer Conference Call Participants John McNulty - BMO Capital Markets David Begleiter - Deutsche Bank Aleksey Yefremov - KeyBanc Capital Markets Angel Castillo - Morgan Stanley Patrick Cunningham - Citi Laurence Alexander - Jefferies David Silver - CL King Operator Good morn ...

Table of Contents Title of each class Trading symbol Name of each exchange on which registered Common stock, par value $0.01 per share ECVT New York Stock Exchange 1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition perio ...

Ecovyst Inc. (NYSE:ECVT) Q2 2022 Results Conference Call July 29, 2022 11:00 AM ET Company Participants Gene Shiels - Director of Investor Relations Kurt Bitting - Chief Executive Officer Mike Feehan - Chief Financial Officer Conference Call Participants John McNulty - BMO Capital Markets Stefan Diaz - Morgan Stanley Daniel Rizzo - Jefferies Patrick Cunningham - Citigroup David Silver - CL King Hamed Khorsand - BWS Financial Operator Good morning. My name is Katie, and I will be your conference operator tod ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 | --- | --- | |----------------------------------------------------------------------------|------------------------------------------| | | | | | | | ECOVYST | INC. | | De ...

Ecovyst Inc. (NYSE:ECVT) Q1 2022 Results Conference Call April 28, 2022 5:00 PM ET Company Participants Mike Feehan - Chief Financial Officer Kurt Bitting - Chief Executive Officer Tom Schneberger - President Conference Call Participants John McNulty - BMO Capital Markets Aleksey Yefremov - KeyBanc David Begleiter - Deutsche Bank Angel Castillo - Morgan Stanley David Silver - CL King Hamed Khorsand - BWS Financial Kevin Grundy - Jefferies Operator Good morning. My name is Catherine, and I will be your confe ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Securities registered pursuant to Section 12(b) of the Act: FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38221 ECOVYST INC. Delaware 81-3406833 (State or other jurisdiction of i ...